Tootfinder

Jim Harbaugh on Chargers QB's three-TD night: 'Just another stellar performance by Justin Herbert' https://www.nfl.com/news/jim-harbaugh-on-chargers-qb-s-three-td-night-just-another-stellar-performance-by-justin-h…

What do we mean by stellar mass? The impact of the pre-main sequence on the mass to light ratio of young and intermediate age stellar populations
Elizabeth R. Stanway (University of Warwick, UK), Conor M. Byrne (University of Warwick, UK), Ankur Upadhyaya (University of Warwick, UK)
https://arxiv.org/abs/2508.16394

What do we mean by stellar mass? The impact of the pre-main sequence on the mass to light ratio of young and intermediate age stellar populations
Stellar population synthesis models are an essential tool with which galaxy physical parameters are extracted from observations. However they are built on assumptions designed for use in the local Universe, and not always appropriate to high redshift galaxies. Here we consider the impact of including the hitherto-neglected stellar pre-main sequence delay timescale on the interpretation of composite stellar populations at ages of <1 Gyr. We find that doing so has an impact on the optical luminos…

StrCGAN: A Generative Framework for Stellar Image Restoration
Shantanusinh Parmar
https://arxiv.org/abs/2509.19805 https://arxiv.org/pdf/2509.19805

StrCGAN: A Generative Framework for Stellar Image Restoration
We introduce StrCGAN (Stellar Cyclic GAN), a generative model designed to enhance low-resolution astrophotography images. Our goal is to reconstruct high-fidelity ground truth-like representations of celestial objects, a task that is challenging due to the limited resolution and quality of small-telescope observations such as the MobilTelesco dataset. Traditional models such as CycleGAN provide a foundation for image-to-image translation but are restricted to 2D mappings and often distort the m…

Theory, Simulations and Observations of Stellar Mergers
Fabian R. N. Schneider
https://arxiv.org/abs/2509.18421 https://arxiv.org/pdf/2509.18421

A Comparison of Full Spectral Fitting Codes for Measuring the Stellar Initial Mass Function and Other Stellar Population Properties in Elliptical Galaxies
Ilaria Lonoce, Anja Feldmeier-Krause, Alexandra Masegian, Wendy L. Freedman
https://arxiv.org/abs/2508.16525

A Comparison of Full Spectral Fitting Codes for Measuring the Stellar Initial Mass Function and Other Stellar Population Properties in Elliptical Galaxies
We present a comparative test of four widely used full spectral fitting codes, with the aim of answering the question: how robust is the retrieval of the stellar initial mass function (IMF) and other stellar properties of galaxies? We used ALF, PyStaff, Starlight, and pPXF to fit a set of optical+near-infrared spectroscopic data from the Magellan telescope of the two brightest galaxies in the Fornax cluster, NGC1399 and NGC1404. By fitting the same data set with the same models, we can compare …

Morphology of Young Massive Stellar Clusters with Next-Generation IACTs
Alberto Bonollo, Paolo Esposito, Andrea Giuliani, Patrizia Caraveo, Giorgio Galanti, Silvia Crestan, Michela Rigoselli, Sandro Mereghetti
https://arxiv.org/abs/2509.20150

Morphology of Young Massive Stellar Clusters with Next-Generation IACTs
The term PeVatron designates astrophysical objects capable of accelerating particles to PeV energies. Their nature and particle acceleration mechanisms are uncertain, but ultra-high-energy gamma rays are produced when particles accelerated by either leptonic or hadronic PeVatrons interact with the surrounding medium or radiation fields. The atmospheric air shower observatory LHAASO detected photons with energies above 100 TeV from 43 sources in the Galactic Plane, proving the existence of PeVat…

Evolution of Stellar Activity and Habitable zone: I. Ultraviolet Emission of Dwarfs in Open Clusters and Field Stars
Xue Li, Song Wang, Jun Ma, Henggeng Han, Yang Huang, Jifeng Liu
https://arxiv.org/abs/2509.18559

Playing CHESS with stars. I. Search for similar stars in large spectroscopic data sets
J. E. Mart\'inez Fern\'andez, S. \"Ozdemir, R. Smiljanic, M. L. L. Dantas, A. R. da Silva
https://arxiv.org/abs/2509.19443

Playing CHESS with stars. I. Search for similar stars in large spectroscopic data sets
Context: Massive amounts of spectroscopic data obtained by stellar surveys are feeding an ongoing revolution in our knowledge of stellar and Galactic astrophysics. Analysing these data sets to extract the best possible astrophysical parameters on short time scales represents a considerable challenge. Aims: The differential analysis method is known to return the most precise results in the spectroscopic analyses of F-, G-, and K-type stars. However, it can only be applied to stars with similar p…

Cowboys' Dak Prescott details 'huge' benefit of stellar run game https://www.sportingnews.com/us/nfl/dallas-cowboys/news/cowboys-dak-prescott-details-huge-benefit-stellar-run-game/189ba46d876214…

Zonal winds in Titan's middle atmosphere from a stellar occultation observed with Keck adaptive optics
Theresa C. Marlin, Eliot F. Young, Katherine de Kleer, Martin Cordiner, Nicholas A. Lombardo, Imke de Pater, Juan M. Lora, Paul Corlies, Richard Cosentino, Conor Nixon, Sebastien Rodriguez, Alexander Thelen
https://arxiv.org/abs/2509.…

Zonal winds in Titan's middle atmosphere from a stellar occultation observed with Keck adaptive optics
We present spatially resolved Keck/NIRC2 images of a stellar occultation by Titan on September 5, 2022 and compare them to predictions from concurrent ALMA observations and a suite of General Circulation Model (GCM) simulations. ALMA data and GCM simulations can predict middle atmosphere zonal wind distributions, which in turn produce diagnostic occultation image sequences. We construct an occultation forward model using the temperature profile measured by the Huygens Atmospheric Structure Inst…

@…
It's refreshing to come back to the fedilab client.
The UI can benefit from even more consolidation, but I'm very impressed by how much it's improved already and by the many new features added since using it a year ago.
Stellar work!

Linking Young Stellar Object Morphology to Evolutionary Stages with Self-Organizing Maps
David Hernandez, Odysseas Dionatos, Marc Audard, G\'abor Marton, Julia Roquette, Ilknur Gezer, M\'at\'e Madar\'asz, Kai L. Polsterer
https://arxiv.org/abs/2509.19069

Linking Young Stellar Object Morphology to Evolutionary Stages with Self-Organizing Maps
Studies in the past few decades have investigated young stellar object evolution based on their spectral energy distribution (SED). The SED is heavily influenced not only by evolutionary stage, but also the morphology of the young star. This work is part of the NEMESIS project which is aiming to revisit star formation with the aid of machine learning techniques and provides the framework for this work. In a first effort towards a novel spectro-morphological classification we analyzed young stel…

The distribution and origin of metals in simulated Milky Way-like galaxies
Federico G. Iza, Cecilia Scannapieco, Sebasti\'an E. Nuza, R\"udiger Pakmor, Robert J. J. Grand, Facundo A. G\'omez, Volker Springel, Federico Marinacci, Francesca Fragkoudi
https://arxiv.org/abs/2509.20079

The distribution and origin of metals in simulated Milky Way-like galaxies
In this study, we investigate the distribution and origin of chemical elements in different stellar components of simulated Milky Way-like galaxies in relation to their mass assembly history, stellar age, and metallicity. Using a sample of 23 simulated galaxies from the Auriga project, we analysed the evolution of heavy elements produced by stellar nucleosynthesis. To study the chemical evolution of the stellar halo, bulge, and warm and cold discs of the model galaxies, we applied a decompositi…

Constraints on the extreme mass-ratio inspiral population from LISA data
Shashwat Singh, Christian E. A. Chapman-Bird, Christopher P L Berry, John Veitch
https://arxiv.org/abs/2508.16399

Constraints on the extreme mass-ratio inspiral population from LISA data
Gravitational waves from extreme mass-ratio inspirals (EMRIs), the inspirals of stellar-mass compact objects into massive black holes, are predicted to be observed by the Laser Interferometer Space Antenna (LISA). A sufficiently large number of EMRI observations will provide unique insights into the massive black hole population. We have developed a hierarchical Bayesian inference framework capable of constraining the parameters of the EMRI population, accounting for selection biases. We levera…

Magnetar-like flares behind the high-energy emission in LS 5039
V. Bosch-Ramon, M. V. Barkov
https://arxiv.org/abs/2509.19173 https://arxiv.org/pdf/2509.19…

https://www.youtube.com/watch?v=cejvjP-a77k <- Fly through Gaia’s 3D map of stellar nurseries: https://www.esa.int/Science_Exploration/Space_Science/Gaia/Fly_through_Gaia_s_3D_map_of_stellar_nurseries <- The Hα sky in three dimensions / A three-dimensional, multiwavelength view and time-dependent analysis of the Milky Way’s local ionized gas: https://academic.oup.com/mnrasl/article/540/1/L21/8085153 / https://academic.oup.com/mnras/article/541/3/2324/8172009

An Educational Guide for 2D Stellar Structure Calculations of Rapidly Rotating Stars using the ESTER code
Russel White, Jane Pratt, Michel Rieutord
https://arxiv.org/abs/2509.20264

An Educational Guide for 2D Stellar Structure Calculations of Rapidly Rotating Stars using the ESTER code
The Evolution STEllaire en Rotation (ESTER) code is the first 2D stellar structure code to be made open-source and freely available to the astronomy and astrophysics community. An important and novel advancement of this code is that it can reproduce the distorted shape and observable signatures (e.g., gravity darkening) of rapidly rotating stars. ESTER also calculates the steady-state large-scale flows within the star, namely their differential rotation and associated meridional circulation. In…

Vikings-Chargers on 'Thursday Night Football': What We Learned from Los Angeles' 37-10 win https://www.nfl.com/news/vikings-chargers-on-thursday-night-football-what-we-learned-from-los-angeles-37-10-win

Glimmers in the Cosmic Dawn. III. On the Photometrically Determined Black Hole Mass to Stellar Mass Relation Across Cosmic Time
Alice R. Young, Matthew J. Hayes, Alberto Saldana-Lopez, Axel Runnholm, Vieri Cammelli, Jonathan C. Tan, Richard S. Ellis, Benjamin W. Keller, Jens Melinder, Jasbir Singh
https://arxiv.org/abs/2508.15905

Glimmers in the Cosmic Dawn. III. On the Photometrically Determined Black Hole Mass to Stellar Mass Relation Across Cosmic Time
We present the results from performing spectral energy distribution (SED) fitting on 121 variable active galactic nuclei (AGN) candidates in the Hubble Ultra Deep Field (HUDF) using photometry from both the Hubble Space Telescope (HST) and the James Webb Space Telescope (JWST) covering $0.2 - 4.8$ microns. We designed a bespoke SED fitting code which decomposes the total SED into its stellar and AGN contributions. Our SED fitting retrieves a significant contribution to the total SED from an AGN…

3 things to know about Cowboys: Stellar offense, struggling defense https://www.reviewjournal.com/sports/raiders/3-things-to-know-about-cowboys-stellar-offense-struggling-defense-3581894/

Internal dynamics and structure of Cepheus OB4. The asymmetric expansion of Berkeley 59
Bruno Wiesneth, Koraljka Muzic, Victor Almendros-Abad
https://arxiv.org/abs/2509.19175 ht…

Internal dynamics and structure of Cepheus OB4. The asymmetric expansion of Berkeley 59
Accurate measurements of young stellar cluster internal dynamics provide crucial insights into their formation. With Gaia, we are now able to trace stellar motions and study the dynamics of star clusters with unprecedented precision, but this requires a reliable list of probable members. We examine a 2 deg-radius region in Cepheus OB4, centered on the young cluster Berkeley 59, to build a reliable candidate member list, enabling the study of the cluster's structure, kinematics, and stellar popu…

Spinning into the Gap: Direct-Horizon Collapse as the Origin of GW231123 from End-to-End GRMHD Simulations
Ore Gottlieb, Brian D. Metzger, Danat Issa, Sean E. Li, Mathieu Renzo, Maximiliano Isi
https://arxiv.org/abs/2508.15887

Spinning into the Gap: Direct-Horizon Collapse as the Origin of GW231123 from End-to-End GRMHD Simulations
GW231123, the most massive binary black hole (BH) merger observed to date, involves component BHs with masses inside the pair-instability mass gap and unusually high spins. This challenges standard formation channels such as classical stellar evolution and hierarchical mergers. However, stellar rotation and magnetic fields, which have not been systematically incorporated in prior models, can strongly influence the BH properties. We present the first self-consistent simulations tracking a massiv…

🔊 #NowPlaying on #BBCRadio3:
#OperaOn3
- Alban Berg's Wozzeck
Simon Rattle conducts Alban Berg’s Wozzeck, featuring a stellar cast headed by Christian Gerhaher as Wozzek and Malin Byström as Marie with HK Gruber as the Speaker.
Relisten now 👇
https://www.bbc.co.uk/programmes/m002mc14

Panthers-49ers on 'Monday Night Football': What We Learned from San Francisco's 20-9 win https://www.nfl.com/news/panthers-49ers-on-monday-night-football-what-we-learned-from-san-francisco-s-20-9-win

Toward Engineering AGI: Benchmarking the Engineering Design Capabilities of LLMs
Xingang Guo, Yaxin Li, Xiangyi Kong, Yilan Jiang, Xiayu Zhao, Zhihua Gong, Yufan Zhang, Daixuan Li, Tianle Sang, Beixiao Zhu, Gregory Jun, Yingbing Huang, Yiqi Liu, Yuqi Xue, Rahul Dev Kundu, Qi Jian Lim, Yizhou Zhao, Luke Alexander Granger, Mohamed Badr Younis, Darioush Keivan, Nippun Sabharwal, Shreyanka Sinha, Prakhar Agarwal, Kojo Vandyck, Hanlin Mai, Zichen Wang, Aditya Venkatesh, Ayush Barik, Jiankun…

Toward Engineering AGI: Benchmarking the Engineering Design Capabilities of LLMs
Today, industry pioneers dream of developing general-purpose AI engineers capable of designing and building humanity's most ambitious projects--from starships that will carry us to distant worlds to Dyson spheres that harness stellar energy. Yet engineering design represents a fundamentally different challenge for large language models (LLMs) compared to traditional textbook-style problem solving or factual question answering. Real-world engineering design demands the synthesis of domain knowle…

A high geometric albedo and small size of the Haumea cluster member (24835) 1995 SM55 from a stellar occultation and photometric observations
J. L. Ortiz, N. Morales, B. Sicardy, F. L. Rommel, F. Braga-Ribas, Y. Kilic, E. Fern\'andez-Valenzuela, J. L. Rizos, B. Morgado, L. Catani, M. Kretlow, J. M. G\'omez-Lim\'on, J. Desmars, P. Santos-Sanz, O. Erece, I. Akoz, K. Uluc, S. Kaspi, A. Marciniak, V. Turcu, D. Moldovan, A. Sonka, E. Petrescu, A. Nedelcu, C. Nehir, R. Morales, R…

A high geometric albedo and small size of the Haumea cluster member (24835) 1995 SM55 from a stellar occultation and photometric observations
Trans-Neptunian objects (TNOs) are among the most ancient bodies of the solar system. Understanding their physical properties is key to constraining their origin and the evolution of the outer regions beyond Neptune. Stellar occultations provide highly accurate size and shape information. (24835) 1995 SM55 is one of the few members of the Haumea cluster and thus of particular interest. We aimed to determine its projected size, absolute magnitude, and geometric albedo, and to compare these with …

Charlie Kirk & Stochastic Terrorism
https://www.instagram.com/reel/DOgSkSygGz-/

Cosmic inventory of the background fields of relativistic particles in the Universe
Jonathan Biteau
https://arxiv.org/abs/2509.17954 https://arxiv.org/pdf/…

Cosmic inventory of the background fields of relativistic particles in the Universe
The extragalactic background is composed of the emission from all astrophysical sources, both resolved and unresolved, in addition to any diffuse components. In the last decade, there has been significant progress in our understanding of the cosmic history of extragalactic emissions associated with stellar evolution and accretion onto supermassive black holes, largely enabled by the extensive body of multi-wavelength data. The brightness of the extragalactic sky is now measured in photons, neut…

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Benchmark stars for mean stellar density and surface gravity estimates of solar-type stars
P. F. L. Maxted

Radio burst from a stellar coronal mass ejection: #CoronalMassEjection (CME) seen on our Sun, and implies a devasting impact for any planet unlucky enough to orbit the star.

Both Stellar Mass and Gravitational Potential Shape the Gas-Phase Metallicity
Maria Koller, Roberto Maiolino, William M. Baker
https://arxiv.org/abs/2509.18961 https://

Both Stellar Mass and Gravitational Potential Shape the Gas-Phase Metallicity
The relation between metallicity and galaxy mass (the so-called mass-metallicity relation) is the strongest and most prominent among scaling relations between chemical enrichment and galactic properties. However, it is unclear whether this relation primarily traces metal retention or the integrated production of metals, as past studies have obtained contrasting results. We investigate this issue through an extensive Random Forest and Partial Correlations analysis of spectral cubes of 4,500 gala…

Stellar performance by former 1st rounder, one-off or Cowboys success? https://cowboyswire.usatoday.com/story/sports/nfl/cowboys/2025/11/21/cowboys-tyler-guyton-evaluation-projection-week-12/87378503007/

Solar and Stellar Activity
S. Bellotti, J. Morin
https://arxiv.org/abs/2509.20202 https://arxiv.org/pdf/2509.20202

Solar and Stellar Activity
This chapter provides an overview of the magnetic activity of the Sun and stars, discussing its underlying physical origin, manifestations, and fundamental role in exoplanet studies. It begins with a summary of the Sun's magnetic activity from the surface towards the outer atmospheric layers, highlighting features such as sunspots, faculae, chromospheric structures, and their temporal modulation known as the activity cycle. These phenomena are sustained throughout the lifetime of the Sun by the…

Deep chemical tagging - Identifying open clusters and moving groups in chemical space with graph attention networks
Lorenzo Spina, Milan Quandt Rodriguez, Laura Magrini, Leda Berni, Sara Lucatello, Marco Canducci
https://arxiv.org/abs/2509.18268

Reverberation lags viewed in hard X-rays from an accreting stellar-mass black hole
Bei You, Wei Yu, Adam Ingram, Barbara De Marco, Jin-Lu Qu, Zong-Hong Zhu, Andrea Santangelo, Sai-En Xu
https://arxiv.org/abs/2509.16608

Reverberation lags viewed in hard X-rays from an accreting stellar-mass black hole
Accreting black holes are thought to swallow matter in the form of a disk and a hot cloud of plasma that glows brightly in X-rays, known as the corona. The X-ray emitting region is far too small to be directly imaged, but rapid variability of the X-ray signal can be used to infer the geometry by measuring time lags caused by material propagating towards the black hole and by coronal X-rays reflecting off the disk to imprint a reverberation lag. Reverberation lags can be recognized by characteri…

Extreme Lithium Depletion in Solar Twins: Challenging Non-Standard Mixing Models
Isabelle Winnick, Jhon Yana Galarza, Henrique Reggiani, Thiago Ferreira, Isabelle Baraffe, Diego Lorenzo-Oliveira, Micaela Oyague, Rita Valle, Renzo Trujillo Diaz, Nathan Leigh, Matias Flores Trivigno, Ricardo Lopez-Valdivia, Gabriela Carvalho Silva, Eder Martioli, Helio Perottoni
…

Extreme Lithium Depletion in Solar Twins: Challenging Non-Standard Mixing Models
Lithium (Li) is a powerful tracer of stellar mixing, gradually depleted in solar twins by non-standard transport below the convective zone. Here, we identify six new solar twins with exceptionally low Li levels that are not explained by current non-standard mixing models and, together with our previously reported anomalous solar twin HIP 8522, suggest a distinct population marked by a violent evolutionary past. Employing high-resolution spectra ($R=60,000 - 165,000$), we infer precise stellar p…

The evolution of velocity dispersion in the Sco-Cen OB association
Josefa E. Gro{\ss}schedl (Astronomical Institute of the Czech Academy of Sciences, Universit\"at zu K\"oln, University of Vienna), Jo\~ao Alves (University of Vienna), Sebastian Ratzenb\"ock (Center for Astrophysics, Harvard and Smithsonian), N\'uria Miret-Roig (FQA, Universitat de Barcelona, ICCUB, Universitat de Barcelona), Alvaro Hacar (University of Vienna), Sebastian Hutschenreuter (University of…

The evolution of velocity dispersion in the Sco-Cen OB association
We study how stellar velocity dispersion within the Scorpius-Centaurus OB association (Sco-Cen) has evolved over approximately 20 million years, from its formation to the present day. Using data from the \textit{Gaia} mission along with supplementary stellar radial velocities, we identified a surprising sequence of abrupt jumps and intervening plateaus in the velocity dispersion correlating with star formation bursts. These changes in velocity dispersion coincide with the association expanding …

Probing Stellar Kinematics with the Time-Asymmetric Hanbury Brown and Twiss Effect
Lucijana Stanic, Ivan Cardea, Edoardo Charbon, Domenico Della Volpe, Daniel Florin, Andrea Guerrieri, Gilles Koziol, Etienne Lyard, Nicolas Produit, Aramis Raiola, Prasenjit Saha, Vitalii Sliusar, Achim Vollhardt, Roland Walter
https://arxiv.org/abs/2509.131…

Probing Stellar Kinematics with the Time-Asymmetric Hanbury Brown and Twiss Effect
Intensity interferometry (II) offers a powerful means to observe stellar objects with a high resolution. In this work, we demonstrate that II can also probe internal stellar kinematics by revealing a time-asymmetric Hanbury Brown and Twiss (HBT) effect, causing a measurable shift in the temporal correlation peak away from zero delay. We develop numerical models to simulate this effect for two distinct astrophysical scenarios: an emission-line circumstellar disk and an absorption-line binary sys…

Constraining the Mass Loss and the Kinetic Energy of Solar Coronal Mass with Far-Ultraviolet Flares
Nuri Park, Evgenya L. Shkolnik, Joe Llama
https://arxiv.org/abs/2509.16477 ht…

Constraining the Mass Loss and the Kinetic Energy of Solar Coronal Mass with Far-Ultraviolet Flares
Stellar eruptive events, such as flares and coronal mass ejections (CMEs), can affect planetary habitability by disturbing the stability of their atmospheres. For instance, strong stellar flares and CMEs can trigger atmospheric escape and, in extreme cases, may strip away the atmosphere completely. While stellar flares have been observed and explored at a wide range of wavelengths, the physical properties of stellar CMEs remain unconstrained due to the difficulty in observing them. In this cont…

The origin of the intra-cluster light in The Three Hundred simulations
A. Contreras-Santos, A. Knebe, W. Cui, I. Alonso Asensio, C. Dalla Vecchia, R. Haggar, R. A. Mostoghiu Paun, F. R. Pearce, E. Rasia, G. Martin, S. E. Nuza, G. Yepes
https://arxiv.org/abs/2509.17831

The origin of the intra-cluster light in The Three Hundred simulations
We investigate the origin and formation mechanisms of the intra-cluster light (ICL) in The Three Hundred simulations, a set of 324 hydrodynamically resimulated massive galaxy clusters. The ICL, a diffuse component of stars not bound to individual galaxies, serves as a key tracer of cluster formation and evolution. Using two hydrodynamics implementations, Gadget-X and Gizmo-Simba, we identify the stellar particles comprising the ICL at z=0 and trace them back in time to the moments when they wer…

Collapse of rotating very massive stellar cores leading to a black hole and a massive disk as a source of gravitational waves
Masaru Shibata, Sho Fujibayashi
https://arxiv.org/abs/2509.15619

Collapse of rotating very massive stellar cores leading to a black hole and a massive disk as a source of gravitational waves
We derive models of rotating very massive stellar cores with mass $\approx 10^2$--$10^4M_\odot$ which are marginally stable to the pair-unstable collapse, assuming that the core is isentropic and composed primarily of oxygen. It is shown that the cores with mass $\lesssim 10^3M_\odot$ can form a massive disk with the mass more than 10% of the core mass around the formed black hole if the core is rotating with more than 30% of the Keplerian limit. We also indicate that the formation of rapidly s…

Stars and ionized gas in UGCA 320: a nearby gas-rich, dwarf Irregular galaxy
Adebusola B. Alabi, S. Ilani Loubser, Moses K. Mogotsi, N. Zabel
https://arxiv.org/abs/2509.20359 ht…

Stars and ionized gas in UGCA 320: a nearby gas-rich, dwarf Irregular galaxy
UGCA 320 is a gas-rich dwarf irregular galaxy which belongs to a nearby, relatively isolated group of dwarf galaxies. Here, we combine multi-band HST imaging data with deep long-slit SALT/RSS and integral-field VLT/MUSE spectral data to study the stellar and ionized gas components of UGCA 320. Our imaging data analysis reveals a very blue (V-I~0.1 mag), flattened radial colour profile. We detect an abundance of ionized gas in UGCA 320 powered mostly by recent star formation. The stellar disc in…

Chromaticity of stellar activity in radial velocities : Anti-correlated families of lines on the M dwarf EV Lac with SPIRou and SOPHIE
Pierre Larue, Xavier Delfosse, Andres Carmona, Nad\`ege Meunier, \'Etienne Artigau, Stefano Bellotti, Paul Charpentier, Claire Moutou, Jean-Fran\c{c}ois Donati, Isabelle Boisse, Thierry Forveille, Luc Arnold, Vincent Bourrier, Xavier Bonfils, Charles Cadieux, Antoine Chomez, Neil Cook, Pia Cortes Zuleta, Paul Cristofari, Rodrigo Diaz, Ren\'e Doy…

Chromaticity of stellar activity in radial velocities : Anti-correlated families of lines on the M dwarf EV Lac with SPIRou and SOPHIE
Context. In the search for exoplanets using radial velocities (RV), stellar activity has become one of the main limiting factors for detectability. Fortunately, activity-induced RV signals are wavelength-dependent or chromatic, unlike planetary signals. This study exploits the broad spectral coverage provided by the combined use of SOPHIE and SPIRou velocimeters to investigate the chromatic nature of the activity signal of the highly active M dwarf EV Lac. Aims. We aim to understand the origi…

Direct Imaging Explorations for Companions from the Subaru/IRD Strategic Program - Discovery of a #BrownDwarf Companion around a Nearby Mid-M-dwarf LSPM J1446 4633: https://iopscience.iop.org/article/10.3847/1538-3881/ae08b6 -> Discovery of Brown Dwarf Companion Provides New Insight into Stellar and Planetary Formation and Evolution: https://keckobservatory.org/brown-dwarf/

The young stellar clusters in M51 and the impact of GMC encounters
Timmi G. J{\o}rgensen, Ross P. Church
https://arxiv.org/abs/2509.17846 https://arxiv.org…

The young stellar clusters in M51 and the impact of GMC encounters
We investigate the young stellar cluster population of M51 and how it is affected by encounters with giant molecular clouds (GMCs). We combine a galactic model with $N$-body simulations of 5000 unique clusters in the mass range [600 - 24000] $M_{\odot}$. We simulate each cluster twice: with ($C_R$) and without ($C_N$) tidal perturbations from the GMCs. We are able to reproduce the majority of the observed mass- and age functions. However, for the age function we see a large discrepancy for clus…

Probing dust and grain growth in the optically thick circumbinary ring of V892 Tau
Antoine Alaguero, Fran\c{c}ois M\'enard, Nicol\'as Cuello, \'Alvaro Ribas, Elena Viscardi, Enrique Mac\'ias, Miguel Vioque, James Miley
https://arxiv.org/abs/2509.17424

Probing dust and grain growth in the optically thick circumbinary ring of V892 Tau
A considerable proportion of young stars belong to multiple star systems. Constraining the planet formation processes in multiple stellar systems is then key to understand the global exoplanet population. This study focuses on investigating the dust reservoir within the triple system V892 Tau. Our objective is to establish constraints on the properties and characteristics of the dust present in the system's circumbinary ring. Based on archival ALMA and VLA data from 0.9 mm to 9.8 mm, we present…

Effects of galactic environment on accretion dynamics onto a rotating centrally located black hole and on emergent analogue gravity
Ripon Sk, Sangita Chatterjee, Sankhasubhra Nag
https://arxiv.org/abs/2509.18833

Cowboys preach 'team effort' for stellar Javonte Williams run game https://www.sportingnews.com/us/nfl/dallas-cowboys/news/cowboys-preach-team-effort-stellar-javonte-williams-run-game/5b155f50de92…

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- The Interplay of Parametric and Magnetorotational Instabilities in Oscillatory Shear Flows
Callum W. Fairbairn, James M. Stone

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Massive extended streamers feed high-mass young stars
Fernando A. Olguin, et al.

Lost Sisters Found - TESS and Gaia Reveal a Dissolving #Pleiades Complex: https://iopscience.iop.org/article/10.3847/1538-4357/ae0724 -> The “Seven Sisters” Just Found Thousands of Long-Lost Siblings / The Pleiades is part of an enormous stellar complex birthed by the same star-forming event: https://uncnews.unc.edu/2025/11/12/the-seven-sisters-just-found-thousands-of-long-lost-siblings/ / https://carnegiescience.edu/pleiades-part-enormous-stellar-complex-birthed-same-star-forming-event

Identifying close-in Jupiters that arrived via disk migration: Evidence of primordial alignment, preference of nearby companions and hint of runaway migration
Yugo Kawai, Akihiko Fukui, Noriharu Watanabe, Sho Fukazawa, Norio Narita
https://arxiv.org/abs/2509.16322

Identifying close-in Jupiters that arrived via disk migration: Evidence of primordial alignment, preference of nearby companions and hint of runaway migration
Two leading hypotheses for hot Jupiter migration are disk migration and high-eccentricity migration (HEM). Stellar obliquity is commonly used to distinguish them, as high obliquity often accompanies HEM. However, low obliquity does not guarantee disk migration, due to possible spin-orbit realignment or coplanar HEM. Seeking a proxy for disk migration, we investigate the idea that when the circularization timescale of a planet on circular orbit is longer than its age ($τ_\mathrm{cir} > τ_\math…

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Systematic non-thermal velocity increase preceding soft X-ray flare onset: A large-scale Hinode/E...
Andy S. H. To, et al.

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Deep chemical tagging - Identifying open clusters and moving groups in chemical space with graph ...
Lorenzo Spina, Milan Quandt Rodriguez, Laura Magrini, Leda Berni, Sara Lucatello, Marco Ca…

Stellar Feedback Effects on the Mass Distribution of Clouds and Cloud Complexes
Luanna Veroneze Quinalha, Eric P. Andersson, Mordecai-Mark Mac Low
https://arxiv.org/abs/2509.19071

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Observational Constraints on Evolution of Dust Disc Properties in Upper Scorpius
Pinilla, Sierra, Kurtovic, Anania, Andrews, Carpenter, Guerra-Alvarado, Long, Marino, Vioque, Zhang

Environmental history of filament galaxies: stellar mass assembly and star-formation of filament galaxies
D. Zakharova, G. De Lucia, B. Vulcani, F. Fontanot, L. Xie
https://arxiv.org/abs/2509.17697

Environmental history of filament galaxies: stellar mass assembly and star-formation of filament galaxies
Galaxy properties correlate with their position within the cosmic web. While galaxies are observed in an environment today, they may have experienced different environments in the past. The environmental history, linked to pre-processing, leaves an imprint on the properties of galaxies. We use the GAEA semi-analytic model and IllustrisTNG to reconstruct the environmental histories of galaxies between $z=0$ and $z=4$ that today reside in filaments. Our goal is to understand how galaxy properties…

Kinematics of Stellar Streams from Globular Clusters Depend on Black Hole Retention and Star Mass: A Selection Effect for Dark Matter Inference
Newlin C. Weatherford, Ana Bonaca
https://arxiv.org/abs/2509.15307

Kinematics of Stellar Streams from Globular Clusters Depend on Black Hole Retention and Star Mass: A Selection Effect for Dark Matter Inference
Velocity dispersion ($σ$) in stellar streams from globular clusters (GCs) is sensitive to heating by Galactic substructure, including dark matter (DM) subhalos. Recent studies have compared $σ$ in observed and modeled streams to probe DM properties, but have relied on stream models that neglect strong encounters, black holes (BHs), and mass segregation in GCs. Such phenomena may inflate stream $σ$ or introduce selection effects -- e.g., a $σ$ that depends on star mass ($m$). We investigate …

Binary black holes in magnetized AGN disks
Raj Kishor Joshi, Aryan Bhake, Biswajit Banerjee, Bhargav Vaidya, Milton Ruiz, Antonios Tsokaros, Andrea Mignone, Marica Branchesi, Amit Shukla, Miljenko \v{C}emelji\'c
https://arxiv.org/abs/2509.16796

Binary black holes in magnetized AGN disks
Stellar-mass binary black hole (BBH) mergers occurring within the disks of active galactic nuclei (AGN) are promising sources for gravitational waves detectable by the LIGO, Virgo, and KAGRA (LVK) interferometers. Some of these events have also been potentially associated with transient electromagnetic flares, indicating that BBH mergers in dense environments may be promising sources of multi-messenger signals. To investigate the prospects for electromagnetic emission from these systems, we stu…

Numerical Simulations Confirm Wave-Induced Shear Mixing in Stellar Interiors
A. Varghese, R. P. Ratnasingam, L. Ram\'irez-Galeano, S. Mathis, T. M. Rogers
https://arxiv.org/abs/2509.18244

Impacts of small-scale dynamo on rotating columnar convection in stellar convection zones
Yuto Bekki
https://arxiv.org/abs/2509.19046 https://arxiv.org/pdf…

Analysing the prevalence of tidal features in HSC-SSP using self-supervised representation learning
A. Desmons, S. Brough, F. Lanusse, L. Canepa, A. Khalid
https://arxiv.org/abs/2509.18274

[2025-08-25 Mon (UTC), 2 new articles found for astro-ph.SR Solar and Stellar Astrophysics]
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SDSS-V Black Hole Mapper: The Index Diagram as a tool to disentangle the influence of the Host Galaxy in Quasar spectra
C. A. Negrete, R. Sandoval-Orozco, H. Ibarra-Medel, B. Tapia, R. J. Assef, D. Dultzin, I. Lacerna, S. Morrison, S. F. Anderson, P. Rodr\'iguez Hidalgo C. Aydar, F. E. Bauer, E. Benitez, D. Bizyaev, W. N. Brandt, J. R. Brownstein, J. Buchner, I. Cruz-Gonz\'alez, D. Gonz\'alez-Buitrago, H. Hern\'andez-Toledo, N. Jenaro-Ballesteros, A. Koekemoer, Y. Krong…

SDSS-V Black Hole Mapper: The Index Diagram as a tool to disentangle the influence of the Host Galaxy in Quasar spectra
We revisit the Quasar Main Sequence (QMS) by investigating the impact of the stellar component from the host galaxy (HG) on the emission line spectra of the active galactic nuclei (AGN). We first detect spectra with broad emission lines using a line ratio method for a sample of $\sim$3000 high SNR ($>$20) Black Hole Mapper objects (part of the fifth phase of the Sloan Digital Sky Survey). We then built the Index diagram, a novel diagnostic tool using the $z$-corrected spectra, model-free, desig…

Neutrinos from core-collapse supernovae
Georg G. Raffelt (MPP), Hans-Thomas Janka (MPA), Damiano F. G. Fiorillo (DESY)
https://arxiv.org/abs/2509.16306 https://

Neutrinos from core-collapse supernovae
The core of a massive star (M > 8 Msun) eventually collapses. This implosion usually triggers a supernova (SN) explosion that ejects most of the stellar envelope and leaves behind a neutron star (NS) with a mass of up to about 2 Msun. Sometimes the explosion fails and a black hole forms instead. The NS radiates its immense binding energy (some 10% of its rest mass or $2-4\times10^{53}$ erg) almost entirely as neutrinos and antineutrinos of all flavors with typical energies of some 10 MeV. This …

[2025-09-24 Wed (UTC), 21 new articles found for astro-ph.SR Solar and Stellar Astrophysics]
toXiv_bot_toot

[2025-09-25 Thu (UTC), 19 new articles found for astro-ph.SR Solar and Stellar Astrophysics]
toXiv_bot_toot

Fitting the Shadows: Star Formation Scaling Relations in the Low Surface Brightness Regime
Hannah S. Christie, Pauline Barmby, Jason E. Young
https://arxiv.org/abs/2509.20080 ht…

Fitting the Shadows: Star Formation Scaling Relations in the Low Surface Brightness Regime
Classical low surface brightness (LSB) galaxies pose an important challenge to galaxy evolution models. While they are found to host large reservoirs of atomic hydrogen, they display low stellar and star-formation surface densities. Global star formation scaling relations characterize trends in the star formation behaviour of galaxies; when used to compare populations or classes of galaxies, deviations in the observed trends can be used to probe predicted differences in physical conditions. In …

Unveiling the Quantum Nature of Black Holes: Towards a Proof of Hawking Radiation through Gamma-Ray Observations
Atreya Acharyya, Giacomo Cacciapaglia, Manuel Meyer, Francesco Sannino
https://arxiv.org/abs/2509.17599

Unveiling the Quantum Nature of Black Holes: Towards a Proof of Hawking Radiation through Gamma-Ray Observations
Hawking's groundbreaking prediction that black holes emit thermal radiation and ultimately evaporate remains unverified due to the extreme faintness of this radiation for stellar-mass or larger black holes. In this study, we explore a novel observational strategy to search for Hawking radiation from asteroid-mass black hole morsels -- hypothetical small black holes that may form and be ejected during catastrophic events such as binary black hole mergers. These black hole morsels are expected to…

Replaced article(s) found for astro-ph.GA. https://arxiv.org/list/astro-ph.GA/new
[1/1]:
- Turbulent gas-rich discs at high redshift: origin of thick stellar discs through 3D 'baryon slosh...
Hawthorn, et al.

Variability of the DG Tau Forbidden Emission Line Low Velocity Component
Noah Otten, Emma Whelan, Yu-Ru Chou, Michihiro Takami, Aisling Murphy, Andrea Banzatti
https://arxiv.org/abs/2509.19256

Multi-spacecraft Measurements of the Evolving Geometry of the Solar Alfv\'en Surface Over Half a Solar Cycle
Samuel T. Badman, Michael L. Stevens, Stuart D. Bale, Yeimy J. Rivera, Kristopher G. Klein, Tatiana Niembro, Rohit Chhiber, Ali Rahmati, Phyllis L. Whittlesey, Roberto Livi, Davin E. Larson, Christopher J. Owen, Kristoff W. Paulson, Timothy S. Horbury, Jean Morris, Helen O'Brien, Jean-Baptiste Dakeyo, Jaye L. Verniero, Mihailo Martinovic, Marc Pulupa, Federico Fraschetti…

Multi-spacecraft Measurements of the Evolving Geometry of the Solar Alfvén Surface Over Half a Solar Cycle
The geometry of a star's Alfvén surface determines stellar angular momentum loss, separates a causally distinct 'corona' and stellar wind, and potentially affects exoplanetary habitability. The solar Alfvén surface is the only such structure that is directly measurable and since 2021, has been routinely measured in situ by NASA's Parker Solar Probe (Parker). We use these unique measurements in concert with Solar Orbiter and L1 in situ data spanning the first half of the Solar Cycle 25 in time…

Kinematics of the interstellar medium using Gaia: A catalogue of 102 YSO-MC associations within 3.5 kpc from the Sun with 3D velocities
Ji-Xuan Zhou, Guang-Xing Li, Bing-Qiu Chen
https://arxiv.org/abs/2509.18496

Kinematics of the interstellar medium using Gaia: A catalogue of 102 YSO-MC associations within 3.5 kpc from the Sun with 3D velocities
Kinematic information is crucial for understanding the evolution of complex systems, such as interstellar gas. Obtaining full 3D kinematic information is a crucial final step for modeling and interpretation. Molecular clouds are nurseries where stars are born. Stars at a very early stage, like young stellar objects (YSOs), inherit the spatial and kinematic structure of the gas patches they originate from. In this paper, we combine measurements of radial velocities towards the gas and the kinema…

Light curves of time-dependent accretion disk in tidal disruption events
Chenlei Guo, Erlin Qiao
https://arxiv.org/abs/2509.16544 https://arxiv.org/pdf/250…

Light curves of time-dependent accretion disk in tidal disruption events
Tidal disruption events (TDEs) are believed to be an ideal laboratory for studying the evolution of accretion flow around a supermassive black hole (BH). In general, the mass feeding rate to the BH is suggested to be super-Eddington initially, and evolves to be sub-Eddington on timescale of years. In this paper, we carry out calculations of the time-dependent evolution of accretion disk in the standard environment of TDE, i.e., injecting matter at the circularization radius of the stellar debri…

Formation and Diagnostic Use of Carbon Lines in Stripped-Envelope Supernovae
Stan Barmentloo, Anders Jerkstrand
https://arxiv.org/abs/2509.19438 https://ar…

Formation and Diagnostic Use of Carbon Lines in Stripped-Envelope Supernovae
Carbon is one of the main end products of nucleosynthesis in massive stars. In this work, we study the emission signatures of carbon in spectra of stripped envelope supernovae (SESNe). A grid of model nebular spectra is created using the NLTE radiative transfer code SUMO, with stellar evolution- and explosion models as inputs. In the models, [C I] λ8727 and [C I] λλ9824, 9850 are identified as the only significant optical carbon lines, with contribution from both the O/C and He/C zones. To o…

The Role of the Convective Kissing Instability in Cataclysmic Variable Evolution
Conor M. Larsen, James MacDonald
https://arxiv.org/abs/2509.17906 https://…

The Role of the Convective Kissing Instability in Cataclysmic Variable Evolution
The convective kissing instability (CKI) is postulated to occur in low mass stars around the fully convective transition. Non-equilibrium $^{3}$He burning leads to the merging of core and envelope convective zones, which causes abrupt decreases in the stellar radius. It has been suggested by van Saders & Pinsonneault (2012) that these effects may be relevant for cataclysmic variables (CVs). We have performed stellar evolution modeling to study the role of the CKI in CV evolution. We find that t…

Gamma-rays from Wolf-Rayet stellar winds
A. Inventar, G. Peron, S. Recchia, S. Gabici
https://arxiv.org/abs/2510.12510 https://arxiv.org/pdf/2510.12510

Gamma-rays from Wolf-Rayet stellar winds
Gamma-ray observations of young star clusters have recently provided evidence for particle acceleration occurring at stellar wind termination shocks, fueled by the mechanical energy of stellar winds from massive stars. In this work, we explore the possibility that the wind from a single powerful star, whether isolated or part of a cluster, can alone provide sufficient energy to generate gamma-ray emission detectable by current instruments. This scenario is particularly relevant given that a sig…

A comprehensive Gaia spectroscopic study of stars in the Sco-Cen complex: star formation history and disk lifetime
Min Fang, Gregory J. Herczeg
https://arxiv.org/abs/2509.19693 …

A comprehensive Gaia spectroscopic study of stars in the Sco-Cen complex: star formation history and disk lifetime
We re-evaluate the star formation history of the nearby Sco-Cen OB Association with a comprehensive analysis of Gaia XP spectra of more than 7,800 potential members. New spectral classifications are obtained by fitting individual XP spectra with templates derived from empirical spectra of young stars. Combining these spectral classifications in this work and in the literature with archival photometry leads to estimates of V-band extinction and stellar luminosities for a total of 8,846 sources. …

The Stellar Abundances and Galactic Evolution Survey (SAGES). IV. Surface Gravity Estimation and Giant-Dwarf Separation with the DDO51 Filter
Qiqian Zhang, Zhou Fan, Gang Zhao, Ying Wu, Wei Wang, Kai Xiao, Hongrui Gu, Jie Zheng, Jingkun Zhao, Chun Li, Yuqin Chen, Haibo Yuan, Haining Li, Kefeng Tan, Yihan Song, Ali Luo, Nan Song, Yujuan Liu, Yaqian Wu
https://…

The Stellar Abundances and Galactic Evolution Survey (SAGES). IV. Surface Gravity Estimation and Giant-Dwarf Separation with the DDO51 Filter
Reliable estimation of stellar surface gravity (log $g$) for a large sample is crucial for evaluating stellar evolution models and understanding galactic structure; However, it is not easy to accomplish due to the difficulty in gathering a large spectroscopic data set. Photometric sky survey using a specific filter, on the other hand, can play a substantial role in the assessment of log $g$. The Stellar Abundances and Galactic Evolution Survey (SAGES) utilizes eight filters to provide accurate …

CAPOS: The bulge Cluster APOGEE Survey VI. Characterizing multiple stellar populations and chemical abundances in the bulge globular cluster NGC 6569
Nicol\'as Barrera, Sandro Villanova, Doug Geisler, Jos\'e G. Fern\'andez-Trincado, Cesar Mu\~noz
https://arxiv.org/abs/2509.16168

CAPOS: The bulge Cluster APOGEE Survey VI. Characterizing multiple stellar populations and chemical abundances in the bulge globular cluster NGC 6569
Context. The CAPOS project aims to obtain accurate mean abundances and radial velocities for many elements, and it explores the multiple population (MP) phenomenon in Galactic bulge globular clusters (BGCs). NGC 6569 is one of the CAPOS targets. Aims. This study provides a detailed high-resolution spectroscopic analysis of NGC 6569 to derive precise abundances for elements of different nucleosynthetic origins and to unveil its MPs by focusing on key spectral features. Methods. We analyzed APOGE…

Stellar velocity distributions in binary-rich ultrafaint dwarf galaxies
Amery Gration, David D. Hendriks, Payel Das, Daniel Heber, Robert G. Izzard
https://arxiv.org/abs/2509.14316

Stellar velocity distributions in binary-rich ultrafaint dwarf galaxies
Ultrafaint dwarf (UFD) galaxies are dominated by dark matter, the distribution of which may be inferred from the kinematics of that galaxy's stellar population. Star-by-star observations are available for the satellite UFD galaxies of the Milky Way, making them uniquely good laboratories in which to test cosmological predictions at the smallest scales. However, the kinematics of these galaxies are complicated by the presence of binary stars, which alter the stellar velocity distribution. In par…

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Kinematics of Stellar Streams from Globular Clusters Depend on Black Hole Retention and Star Mass...
Newlin C. Weatherford, Ana Bonaca

Protostellar Jets in Star Cluster Formation and Evolution: I. Implementation and Initial Results
Sabrina M. Appel, Blakesley Burkhart, Mordecai-Mark Mac Low, Eric P. Andersson, Claude Cournoyer-Cloutier, Sean Lewis, Stephen L. W. McMillan, Brooke Polak, Simon Portegies Zwart, Aaron Tran, Maite J. C. Wilhelm
https://arxiv.org/abs/2509.15311…

Protostellar Jets in Star Cluster Formation and Evolution: I. Implementation and Initial Results
Stars form in clusters from the gravitational collapse of giant molecular clouds, which is opposed by a variety of physical processes, including stellar feedback. The interplay between these processes determines the star formation rate of the clouds. To study how feedback controls star formation, we use a numerical framework that is optimized to simulate star cluster formation and evolution. This framework, called Torch, combines the magnetohydrodynamical code FLASH with N-body and stellar evol…

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Observation-Based Iterative Map for Solar Cycles. II. The Gnevyshev-Ohl Rule and its Generation M...
Zi-Fan Wang, Jie Jiang, Jing-Xiu Wang

The Yasone catalogue: three new Milky Way satellites and 17 further hypercompact candidates
J. Untzaga, M. Mezcua, S. Bonoli, N. Bastian, J. F. Navarro, S. E. T. Smith, F. P\'erez-Toledo, D. Boyea
https://arxiv.org/abs/2509.15345

The Yasone catalogue: three new Milky Way satellites and 17 further hypercompact candidates
We present the discovery of three new low-latitude (|b| ~ 20$^{\circ}$) Milky Way satellites: Yasone-1, Yasone-2, and Yasone-3. They were identified in our search for compact stellar overdensities in the Panoramic Survey Telescope and Rapid Response System 1, supported by follow-up deep photometric imaging from the Gran Telescopio Canarias OSIRIS instrument and Gaia astrometric data. These three new Milky Way satellites are found as compact stellar overdensities that exhibit structura…

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Simulated 3D $^{56}$Ni Distributions of Type IIp Supernovae
Vartanyan, Burrows, Teryoshin, Wang, Kasen, Tsang, Coleman

The Importance of Standardizing Spectra in the Era of Large Spectroscopic Surveys: A Case Study of M Dwarfs in SDSS-V
Ilija Medan, Zachary Way, B\'arbara Rojas-Ayala, Guy S. Stringfellow, Conor Sayres, Keivan G. Stassun, Andrew R. Casey, S\'ebastien L\'epine, Emma Galligan, Diogo Souto, Andrew K. Saydjari
https://arxiv.org/abs/…

The Importance of Standardizing Spectra in the Era of Large Spectroscopic Surveys: A Case Study of M Dwarfs in SDSS-V
SDSS-V will obtain 100,000s of medium-resolution, optical spectra of M dwarfs with the BOSS instrument. M dwarfs have complex atmospheres, and their spectra contain many wide and dense, overlapping molecular features, so determining accurate stellar parameters by fitting models has been difficult. To circumvent this, other surveys have employed machine learning methods to transfer measurements of stellar parameters from high-resolution spectra to their medium-resolution counterparts. These meth…

Predicting stellar collision outcomes of main sequence stars
Pau Amaro Seoane
https://arxiv.org/abs/2509.12352 https://arxiv.org/pdf/2509.12352

Predicting stellar collision outcomes of main sequence stars
Stellar collisions in dense galactic nuclei might play an important role in fueling supermassive black holes (SMBHs) and shaping their environments. The gas released during these collisions can contribute to SMBH accretion, influencing phenomena such as active galactic nuclei and tidal disruption events of the remnants. We address the challenge of rapidly and accurately predicting the outcomes of stellar collisionsincluding remnant masses and unbound gasacross a broad parameter space of initial…

Searching for Stellar-Feedback-Driven Outflow Signatures: A Deep Dive into NGC 3741
Lexi N. Gault, Liese van Zee, Elizabeth A. K. Adams, James M. Wells, Laura Congreve Hunter, Kristen B. W. McQuinn, Roger E. Cohen, O. Grace Telford
https://arxiv.org/abs/2510.12645

Searching for Stellar-Feedback-Driven Outflow Signatures: A Deep Dive into NGC 3741
Stellar feedback drives winds and outflows critical to the baryon cycles of low-mass galaxies whose shallow gravitational potential wells make them particularly susceptible to mass and metal loss through outflows. However, spatially resolved observations of stellar-feedback-driven outflows are limited due to their low-surface brightness and transient nature. We present the pilot of a larger multi-wavelength study searching for and quantifying stellar-feedback-driven winds and outflows on both s…

[2025-09-23 Tue (UTC), 23 new articles found for astro-ph.SR Solar and Stellar Astrophysics]
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Black hole mass function shift in proto-stellar-clusters driven by gas accretion
Zacharias Roupas
https://arxiv.org/abs/2509.08448 https://arxiv.org/pdf/25…

Black hole mass function shift in proto-stellar-clusters driven by gas accretion
The James Webb Space Telescope (JWST) has observed compact, massive proto-stellar clusters of low metallicity in the Cosmic Gems arc galaxy at high redshift, which represent likely precursors to globular clusters. We model the mass growth of stellar black holes (BHs) during the first few Myr of the life of a massive, compact, gaseous stellar cluster before stellar feedback expels the primordial gas. At high redshift, in a lower metallicity environment stellar winds get weaker allowing for large…

Tracing {\omega}Centauri's origins: Spatial and chemical signatures of its formation history
E. Dondoglio, A. P. Milone, A. F. Marino, A. Mastrobuono-Battisti, E. Bortolan, M. V. Legnardi, T. Ziliotto, F. Muratore, G. Cordoni, E. P. Lagioia, M. Tailo
https://arxiv.org/abs/2509.16719

Tracing ωCentauri's origins: Spatial and chemical signatures of its formation history
ω}Centauri (ωCen) is the most enigmatic Galactic globular cluster (GC), with unmatched chemical complexity. We combine photometric and spectroscopic catalogs to identify its distinct stellar populations and to investigate their spatial distribution and chemical properties, uncovering new insights into the cluster's formation history. We identify the iron-poor stars commonly found in GCs: the first population (1P), with halo-like chemical composition, and the second population (2P), enriched i…

Asteroseismic calibration of the Rossby number and its connection to the stellar dynamo and fundamental properties
Alfio Bonanno, Enrico Corsaro, Travis S. Metcalfe, Sylvain Breton, Orlagh L. Creevey, Christopher J. Lindsay
https://arxiv.org/abs/2510.12471

Asteroseismic calibration of the Rossby number and its connection to the stellar dynamo and fundamental properties
The stellar Rossby number, a dimensionless parameter quantifying the influence of Coriolis forces on convective motions, plays a pivotal role in understanding magnetic stellar evolution. In this work, we explore the connection between the Rossby number and potential dynamo mechanisms in Sun-like stars, as well as its dependence on fundamental stellar properties. We present a novel, detailed asteroseismic calibration of the convective turnover time, incorporating for the first time Gaia photomet…

Radiation Hydrodynamic Simulations of Low-Energy Explosions of Red and Yellow Supergiants
Andrea Antoni, Yan-Fei Jiang, Eliot Quataert
https://arxiv.org/abs/2509.16308 https://

Radiation Hydrodynamic Simulations of Low-Energy Explosions of Red and Yellow Supergiants
A variety of physical processes leads to the low-energy ejection of material from the hydrogen-rich envelopes of red and yellow supergiants. These include common envelope events, stellar mergers, eruptive mass loss, and failed supernovae. These events may appear as luminous red novae, intermediate luminosity red transients, supernova imposters, or other transients with similar lightcurves and colors that are followed by the disappearance of the progenitor star (e.g. failed supernovae). The Vera…

Investigating the influence of radio-faint AGN activity on the infrared-radio correlation of massive galaxies
Giorgia Peluso, Ivan Delvecchio, Jack Radcliffe, Emanuele Daddi, Roger Deane, Matt Jarvis, Giovanni Zamorani, Isabella Prandoni, Myriam Gitti, Cristiana Spingola, Francesco Ubertosi, Mark Sargent, Vernesa Smolcic, Wuji Wang, Jacinta Delhaize, Shuowen Jin, Adam Deller

Investigating the influence of radio-faint AGN activity on the infrared-radio correlation of massive galaxies
It is well-known that star-forming galaxies (SFGs) exhibit a tight correlation between their radio and infrared emissions, commonly referred to as the infrared-radio correlation (IRRC). Recent empirical studies have reported a dependence of the IRRC on the galaxy stellar mass, in which more massive galaxies tend to show lower infrared-to-radio ratios (qIR) with respect to less massive galaxies. One possible, yet unexplored, explanation is a residual contamination of the radio emission from acti…

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- On the Spatial Distribution of Luminous Blue Variables, B[e] Supergiants, and Wolf-Rayet stars in...
John C. Martin, Roberta M. Humphreys, Kris Davidson

The HST Ultraviolet Spectrum of V723 Mon: Additional Evidence of a Stellar Companion
C. S. Kochanek (Department of Astronomy, The Ohio State University), K. Z. Stanek (Department of Astronomy, The Ohio State University), T. A. Thompson (Department of Astronomy, The Ohio State University), T. Jayasinghe (Independent Researcher)
https://arxi…

The HST Ultraviolet Spectrum of V723 Mon: Additional Evidence of a Stellar Companion
V723 Mon is a high mass function (f=1.7Msun) single lined spectroscopic binary with a red giant primary that Jayasinghe et al. (2021) suggested had a black hole as its massive companion. Unfortunately, el-Badry et al. (2022) demonstrated that it had a hotter stellar companion whose detectability in optical spectra was difficult due to its rapid rotation. Here we confirm the presence of the stellar companion with a Hubble Space Telescope STIS ultraviolet spectrum.

Predicting Stellar Parameters of Massive Stars from Light Curves with Machine Learning
Rachel C. Zhang, Kaze W. K. Wong, Gonzalo Holgado, Matteo Cantiello
https://arxiv.org/abs/2509.12411

Predicting Stellar Parameters of Massive Stars from Light Curves with Machine Learning
High-resolution spectroscopic measurements of OB stars are important for understanding processes like stellar evolution, but require labor-intensive observations. In contrast, photometric missions like the Transiting Exoplanet Survey Satellite (TESS) can monitor hundreds of thousands of stars with a range of temporal resolutions, but do not provide such detailed measurements. With surveys like the Legacy Survey of Space and Time promising unprecedented photometric coverage over the next ten yea…

TESS Light Curve Analysis: A Case Study of Stellar Rotation in TIC 445493624
Pratik Paudel, Daya Nidhi Chhatkuli, Bikash Sharma, Ashish Khanal, Nabaraj Khatri, Divash Rai
https://arxiv.org/abs/2509.12609

TESS Light Curve Analysis: A Case Study of Stellar Rotation in TIC 445493624
Stellar rotation is a fundamental parameter governing a star's magnetic activity and evolution. The Transiting Exoplanet Survey Satellite (TESS) provides high-precision photometric data ideal for measuring rotation periods via brightness modulations from starspots. This paper presents a detailed analysis of the star TIC 445493624 using 2-minute cadence data from TESS Sector 58. We process the light curve using a custom pipeline to perform outlier removal, binning, and Savitzky-Golay detrending …

The impact of rotational mixing in intermediate-age star clusters with extended main-sequence turn-offs and extended red clumps
Lorenzo Martinelli, Andrea Miglio, Ga\"el Buldgen, Hannah Schunker, Cyril Georgy, Giacomo Cordoni, Karsten Brogaard, Patrick Eggenberger, Eoin Farrell
https://arxiv.org/abs/2509.13601

The impact of rotational mixing in intermediate-age star clusters with extended main-sequence turn-offs and extended red clumps
The extended main-sequence turn-offs (eMSTOs) and extended red clumps (eRCs) observed in intermediate-age star clusters challenge the traditional understanding of clusters as simple stellar populations. Recently, eMSTOs have been interpreted as signatures of stellar rotation. In this work, we test the effectiveness of rotational mixing in shaping the color-magnitude diagram (CMD) of star clusters. We computed a set of separate single-age synthetic stellar populations, referred to as "Base Stell…